Alter do Chão vs Rio de Janeiro: which is better, month by month

Rio de Janeiro beats Alter do Chão in 7 of 12 months — its lead peaks in April (83 vs 58) — while Alter do Chão wins August and October; they are within 3 points in July, September and November.

Each place is scored under the lens that suits its type. Comfort is SeasonMap's 0–100 estimate from ERA5 climate normals, not a forecast.

Alter do Chão

🇧🇷 Brazil · tropical climate

Best month: August 88/100
Months won: 2 of 12

Rio de Janeiro

🇧🇷 Brazil · tropical climate

Best month: September 88/100
Months won: 7 of 12

Alter do Chão vs Rio de Janeiro — all 12 months

Month	Alter do Chão	Rio de Janeiro	Winner	Gap
January	61Csweltering, soaked, clean air	71Bsweltering, soaked, muggy air	Rio de Janeiro	10
February	59Dsweltering, soaked, clean air	73Bsweltering, soaked, poor air quality	Rio de Janeiro	14
March	57Dsweltering, soaked, clean air	79Bsweltering, soaked, muggy air	Rio de Janeiro	22
April	58Dsweltering, soaked, clean air	83Ahot, rainy, muggy air	Rio de Janeiro	25
May	65Csweltering, soaked, clean air	86Ahot, a little rain, muggy air	Rio de Janeiro	21
June	80Asweltering, soaked, clean air	86Awarm, a little rain, muggy air	Rio de Janeiro	6
July	85Asweltering, rainy, clean air	87Awarm, a little rain, muggy air	Tie	2
August	88Asweltering, a little rain, clean air	83Awarm, a little rain, muggy air	Alter do Chão	5
September	87Asweltering, a little rain, clean air	88Ahot, a little rain	Tie	1
October	82Asweltering, rainy	78Bhot, rainy, muggy air	Alter do Chão	4
November	77Bsweltering, rainy	77Bhot, soaked, muggy air	Tie	0
December	63Csweltering, soaked, muggy air	75Bsweltering, soaked, muggy air	Rio de Janeiro	12

A month is a tie when the two are within 3 points. The widest gap is April (58 vs 83). Tap a month for that month's temperature, rain, humidity and air quality side by side.